Been running Azenis on my two Proteges and the MGB for 4 years now. Going to need new rubber when the FRS arrives; anyone have any real experience with running these as DD 3 season tires as compared to the Azenis?

I can't attest to noise (my Miata makes so many other noises that I'd never notice loud tires), but they drive well and handle Florida's rainy season just fine—even with little tread left. I also road-tripped from Chicago to Florida on them with no complaints. Excellent steering feel and response.

Mine are nearly bald now and the wheels they're on are bent, so I bought a couple pieces of glass and made end tables.

Very different from the RS-3s other than both being very grippy. R1Rs like cold and do much better with water. Easy to overheat. They are more similar to Star Specs--like a very fast wearing Star Spec. The larger sizes have a dual compound (harder, less sticky compound underneath), so don't shave them. They come in some unique sizes like 245/35R17 already mentioned.

Because it wins national street tire autocross trophies, and Toyo pays contingencies?

Some autocrossers are running mixed tire sets with R1Rs out back and more heat tolerant tires on the harder working front end. R1Rs are also used as rain/cold tires, but they aren't the best choice for that use.